如图， $AM$ 是 $\Delta ABC$ 的中线， $D$ 是线段 $AM$ 上一点（不与点 $A$ 重合）． $DE//AB$ 交 $AC$ 于点 $F$ ， $CE//AM$ ，连结 $AE$ ．

下列对几种植物形态、结构等特征的叙述，正确的是（   ）

学习了密度知识后，同学们准备测量物质的密度，选取的器材有：酸奶、量筒、天平（带砝码）、烧杯。小新和小洋同学分别设计了一种测量酸奶密度的实验方案：
方案一：（1）用调好的天平测出空烧杯的质量m₁；（2）向烧杯中倒入一些酸奶，测出它们的总质量m₂；则这些酸奶的质量为____ ；（3）再将烧杯中酸奶倒入量筒中，测出酸奶的体积V；（4）计算出酸奶的密度ρ。
方案二：（1）用调好的天平测出装有适量酸奶的烧杯的总质量m₁；（2）将烧杯中的一部分酸奶倒入量筒中，记下量筒中酸奶的体积V；（3）测出烧杯和剩余酸奶的总质量m₂；计算出酸奶的密度ρ=____ 。
分析与交流发现：方案一中测量体积偏____ ，测出密度偏____ 。（选填“大”、或“小”）

先通读下面的短文，然后根据短文内容和所给首字母，在空格内填入一个适当的词，使短文意思完整。
   M____  friends is a skill like other skills. It improves with practice. If you want to meet people and make friends, you must be willing to take some a____ .
   You must first go where there are many people. You won’t make friends staying at home. Join a club or a party, talking with those who like the s____   things as you do. Or join someone in some a____.
   It’s human nature to feel a bit u____  about the unknown. Most of our fears come from doubts about o____ . Don’t forget they must be feeling the same way. Try to accept yourself as you are, and try to put the other person at ease（自由自在）. You’ll b____  feel comfortable.
   Try to act self-confidently t____  you don’t feel that way. When you enter a room    f____  of strangers, walk tall and straight, look directly at them and smile. Meeting someone new doesn’t mean that you will make friends because friendship is based on mutual liking（基于互相喜欢） and “give and take”. It takes t____  to develop.